Hi guys,
I don't understand the relationship of sympy and mpmath.
As I followed the instructions of 
http://docs.sympy.org/latest/install.html#mpmath 
I installed mpmath and sympy as you can see in the following lines.

$ pip install sympy
Collecting sympy
Requirement already satisfied: mpmath>=0.19 in 
/home/atille/.anaconda2/lib/python2.7/site-packages (from sympy)
Installing collected packages: sympy
Successfully installed sympy-1.0


my code includes the following lines

import sys
import mpmath 
from sympy import *
from sympy import solve
from sympy import init_printing

but results in this error message

Traceback (most recent call last):
  File "./algebraic_calculation_model_6_rescaled.py", line 4, in <module>
    import sympy.mpmath 
  File "/usr/lib/python2.7/dist-packages/sympy/__init__.py", line 20, in 
<module>
    raise ImportError("SymPy now depends on mpmath as an external library. "
ImportError: SymPy now depends on mpmath as an external library. See 
http://docs.sympy.org/latest/install.html#mpmath for more information.

Can you explain my mistake?

Thank you in advance.

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